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2 Syllables: SU
firing, hireling, hiring, ironing, tiring, wiring
3 Syllables: USU
acquiring, admiring, aspiring, conspiring, desiring, enquiring, expiring, inquiring, inspiring, perspiring, requiring, retiring
4 Syllables: USUU
deciphering

Found 19 words across 3 groupings. Skipped 1 excess word of a similar stem.